linux-kernel - Re: [PATCH v7 0/5] cpuset: Enable cpuset controller in default hierarchy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180423135756.GC32341@localhost.localdomain>
Date:   Mon, 23 Apr 2018 15:57:56 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kernel-team@...com, pjt@...gle.com, luto@...capital.net,
        Mike Galbraith <efault@....de>, torvalds@...ux-foundation.org,
        Roman Gushchin <guro@...com>
Subject: Re: [PATCH v7 0/5] cpuset: Enable cpuset controller in default
 hierarchy

On 23/04/18 15:07, Juri Lelli wrote:
> Hi Waiman,
> 
> On 19/04/18 09:46, Waiman Long wrote:
> > v7:
> >  - Add a root-only cpuset.cpus.isolated control file for CPU isolation.
> >  - Enforce that load_balancing can only be turned off on cpusets with
> >    CPUs from the isolated list.
> >  - Update sched domain generation to allow cpusets with CPUs only
> >    from the isolated CPU list to be in separate root domains.
> 

Guess I'll be adding comments as soon as I stumble on something unclear
(to me :), hope that's OK (shout if I should do it differently).

The below looked unexpected to me:

root@...ian-kvm:/sys/fs/cgroup# cat g1/cpuset.cpus
2-3
root@...ian-kvm:/sys/fs/cgroup# cat g1/cpuset.mems

root@...ian-kvm:~# echo $$ > /sys/fs/cgroup/g1/cgroup.threads
root@...ian-kvm:/sys/fs/cgroup# cat g1/cgroup.threads
2312

So I can add tasks to groups with no mems? Or is it this only true in my
case with a single mem node? Or maybe it's inherited from root group
(slightly confusing IMHO if that's the case).